<template>
  <div id="global-uploader">
    <!-- 上传 -->
    <uploader
      ref="uploader"
      :options="options"
      :autoStart="false"
      @file-added="onFileAdded"
      @file-success="onFileSuccess"
      @file-progress="onFileProgress"
      @file-error="onFileError"
      class="uploader-app"
    >
      <uploader-unsupport></uploader-unsupport>

      <uploader-btn id="global-uploader-btn" :attrs="attrs" ref="uploadBtn">选择文件</uploader-btn>
      <uploader-list v-show="panelShow">
        <div class="file-panel" slot-scope="props" :class="{'collapse': collapse}">
          <div class="file-title">
            <h2>文件列表</h2>
            <div class="operate">
              <el-button
                :class="collapse?'el-icon-full-screen':'el-icon-minus'"
                @click="fileListShow"
                type="text"
                :title="collapse ? '展开':'折叠' "
              ></el-button>
              <el-button class="el-icon-close" @click="close" type="text" title="关闭"></el-button>
            </div>
          </div>

          <ul class="file-list">
            <li v-for="file in props.fileList" :key="file.id">
              <uploader-file :class="'file_' + file.id" ref="files" :file="file" :list="true"></uploader-file>
            </li>
            <div class="no-file" v-if="!props.fileList.length">..(｡•ˇ‸ˇ•｡)… 暂无待上传文件</div>
          </ul>
        </div>
      </uploader-list>
    </uploader>
  </div>
</template>

<script>
import { ACCEPT_CONFIG } from "@/upload/config.js";
import Bus from "@/upload/bus.js";
import { simpleUploadURL } from "@/utils/global.js";
import SparkMD5 from "spark-md5";
import { fileAPI } from "@/utils/api.js";
import $ from "jquery";

export default {
  data() {
    return {
      options: {
        target: simpleUploadURL,
        chunkSize: "2048000",
        fileParameterName: "upfile",
        maxChunkRetries: 3,
        testChunks: false, //是否开启服务器分片校验
        // 服务器分片校验函数，秒传及断点续传基础
        /* checkChunkUploadedByResponse: function(chunk, message) {
          let objMessage = JSON.parse(message);
          if (objMessage.skipUpload) {
            return true;
          }
          return (objMessage.uploaded || []).indexOf(chunk.offset + 1) >= 0;
        }, */
        headers: {
          Authorization: "bearer" + localStorage.getItem("token")
        },
        query() {},
        parseTimeRemaining: function(timeRemaining, parsedTimeRemaining) {
          return parsedTimeRemaining
            .replace(/\syears?/, "年")
            .replace(/\days?/, "天")
            .replace(/\shours?/, "小时")
            .replace(/\sminutes?/, "分钟")
            .replace(/\sseconds?/, "秒");
        }
      },
      attrs: {
        accept: ACCEPT_CONFIG.getAll()
      },
      panelShow: false, //选择文件后，展示上传panel
      collapse: false,
      uuid: ""
    };
  },
  mounted() {
    Bus.$on("openUploader", query => {
      this.params = query || {};
      if (this.$refs.uploadBtn) {
        $("#global-uploader-btn").click();
      }
    });
  },
  computed: {
    //Uploader实例
    uploader() {
      return this.$refs.uploader.uploader;
    }
  },
  methods: {
    async onFileAdded(file) {
      this.panelShow = true;
      await this.getUUID();
      this.computeMD5(file);
      Bus.$emit("fileAdded");
    },
    onFileProgress(rootFile, file, chunk) {
      console.log(
        `上传中 ${file.name}，chunk：${chunk.startByte /
          1024 /
          1024} ~ ${chunk.endByte / 1024 / 1024}`
      );
    },
    onFileSuccess(rootFile, file, response, chunk) {
      /* let res = JSON.parse(response);
      // 服务器自定义的错误（即虽返回200，但是是错误的情况），这种错误是Uploader无法拦截的
      if (!res.result) {
        this.$message({ message: res.message, type: "error" });
        // 文件状态设为“失败”
        this.statusSet(file.id, "failed");
        return;
      }
      // 如果服务端返回需要合并
      if (res.needMerge) { */
      // 文件状态设为“合并中”
      this.statusSet(file.id, "merging");
      fileAPI.upload
        .combine({
          uuid: this.uuid
        })
        .then(res => {
          // 文件合并成功
          Bus.$emit("fileSuccess");
          this.statusRemove(file.id);
        })
        .catch(e => {});
      /*   // 不需要合并
      } else {
        Bus.$emit("fileSuccess");
        console.log("上传成功");
      } */
    },
    onFileError(rootFile, file, response, chunk) {
      this.$message({
        message: response,
        type: "error"
      });
    },
    /**
     * 计算md5，实现断点续传及秒传
     * @param file
     */
    computeMD5(file) {
      let fileReader = new FileReader();
      let time = new Date().getTime();
      let blobSlice =
        File.prototype.slice ||
        File.prototype.mozSlice ||
        File.prototype.webkitSlice;
      let currentChunk = 0;
      const chunkSize = 2048000;
      let chunks = Math.ceil(file.size / chunkSize);
      let spark = new SparkMD5.ArrayBuffer();
      // 文件状态设为"计算MD5"
      this.statusSet(file.id, "md5");
      file.pause();
      loadNext();
      fileReader.onload = e => {
        spark.append(e.target.result);
        if (currentChunk < chunks) {
          currentChunk++;
          loadNext();
          // 实时展示MD5的计算进度
          this.$nextTick(() => {
            $(`.myStatus_${file.id}`).text(
              "校验MD5 " + ((currentChunk / chunks) * 100).toFixed(0) + "%"
            );
          });
        } else {
          let md5 = spark.end();
          this.computeMD5Success(md5, this.uuid, file);
          /* console.log(
                `MD5计算完毕：${
                  file.name
                } \nMD5：${md5} \n分片：${chunks} 大小:${
                  file.size
                } 用时：${new Date().getTime() - time} ms`
              ); */
        }
      };

      fileReader.onerror = function() {
        this.error(`文件${file.name}读取出错，请检查该文件`);
        file.cancel();
      };
      function loadNext() {
        let start = currentChunk * chunkSize;
        let end =
          start + chunkSize >= file.size ? file.size : start + chunkSize;
        fileReader.readAsArrayBuffer(blobSlice.call(file.file, start, end));
      }
    },
    async getUUID() {
      try {
        let res = await fileAPI.upload.getUUID(); //获取文件uuid
        this.uuid = res.data.uuid;
      } catch (err) {
        this.error(err + "uuid err");
      }
    },
    computeMD5Success(md5, uuid, file) {
      // 将自定义参数直接加载uploader实例的opts上
      //console.log(uuid);
      Object.assign(this.uploader.opts, {
        query: {
          ...this.params,
          uuid
        }
      });
      file.uniqueIdentifier = md5;
      file.resume();
      this.statusRemove(file.id);
    },
    fileListShow() {
      let $list = $("#global-uploader .file-list");
      if ($list.is(":visible")) {
        $list.slideUp();
        this.collapse = true;
      } else {
        $list.slideDown();
        this.collapse = false;
      }
    },
    close() {
      this.uploader.cancel();
      this.panelShow = false;
    },
    /**
     * 新增的自定义的状态: 'md5'、'transcoding'、'failed'
     * @param id
     * @param status
     */
    statusSet(id, status) {
      let statusMap = {
        md5: {
          text: "校验MD5",
          bgc: "#fff",
          color: "#999"
        },
        merging: {
          text: "合并中",
          bgc: "#e2eeff",
          color: "#999"
        },
        transcoding: {
          text: "转码中",
          bgc: "#e2eeff",
          color: "#999"
        },
        failed: {
          text: "上传失败",
          bgc: "#e2eeff",
          color: "red"
        }
      };

      this.$nextTick(() => {
        let $myStatus = $(`.myStatus_${id}`);
        if ($myStatus) {
          $myStatus
            .css({
              background:
                status == "failed" ? "transparent" : statusMap[status].bgc,
              color: statusMap[status].color
            })
            .text(statusMap[status].text);
        } else {
          $(`<p class="myStatus_${id}"></p>`)
            .appendTo(`.file_${id} .uploader-file-status`)
            .css({
              position: "absolute",
              top: "0",
              left: "0",
              right: "0",
              bottom: "0",
              zIndex: "1",
              background:
                status == "failed" ? "transparent" : statusMap[status].bgc,
              color: statusMap[status].color
            })
            .text(statusMap[status].text);
        }
      });
    },
    statusRemove(id) {
      this.$nextTick(() => {
        $(`.myStatus_${id}`).remove();
      });
    },
    error(msg) {
      this.$notify({
        title: "错误",
        message: msg,
        type: "error",
        duration: 2000
      });
    },
    destroyed() {
      Bus.$off("openUploader");
    }
  }
};
</script>

<style scoped lang="scss">
#global-uploader {
  position: fixed;
  z-index: 20;
  right: 15px;
  bottom: 15px;
  .uploader-app {
    width: 520px;
  }
  .file-panel {
    background-color: #fff;
    border: 1px solid #e2e2e2;
    border-radius: 7px 7px 0 0;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    .file-title {
      display: flex;
      height: 40px;
      line-height: 40px;
      padding: 0 15px;
      border-bottom: 1px solid #ddd;
      .operate {
        flex: 1;
        text-align: right;
      }
    }
    .file-list {
      position: relative;
      height: 240px;
      overflow-x: hidden;
      overflow-y: auto;
      background-color: #fff;
      font-size: 12px;
      > li {
        background-color: #fff;
      }
      /deep/.uploader-file-name {
        width: 42%;
      }
      /deep/.uploader-file-meta {
        width: 0;
      }
      /deep/.uploader-file-status {
        width: 35%;
        text-align: center;
        text-indent: 0;
        overflow: hidden;
        white-space: nowrap;
        text-overflow: ellipsis;
      }
    }
    &.collapse {
      .file-title {
        background-color: #e7ecf2;
      }
    }
  }
  .no-file {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 16px;
  }
  /deep/.uploader-file-icon {
    &:before {
      content: "" !important;
    }
    &[icon="image"] {
      background: url("../../assets/file_icons/Folder.png");
    }
    &[icon="video"] {
      background: url("../../assets/file_icons/Folder.png");
    }
    &[icon="document"] {
      background: url("../../assets/file_icons/Folder.png");
    }
  }
  /deep/.uploader-file-actions > span {
    margin-right: 6px;
  }
}
/* 隐藏上传按钮 */
#global-uploader-btn {
  position: absolute;
  clip: rect(0, 0, 0, 0);
}
</style>